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    <p>now that you are already using boost with lexical_cast, just parse each line with <a href="http://www.boost.org/doc/libs/1_38_0/doc/html/string_algo/reference.html#header.boost.algorithm.string.split_hpp" rel="nofollow noreferrer">boost::split()</a> and <a href="http://www.boost.org/doc/libs/1_38_0/doc/html/boost/algorithm/is_any_of.html" rel="nofollow noreferrer">boost::is_any_of()</a> into 1 2-element vector, with token_compress turned on. </p> <p>the following code illustrates the parse, but skips the numeric conversion, which could be solved easily with boost lexical_cast. </p> <pre><code>#include &lt;fstream&gt; #include &lt;sstream&gt; #include &lt;string&gt; #include &lt;iostream&gt; #include &lt;vector&gt; #include &lt;boost/algorithm/string/split.hpp&gt; #include &lt;boost/algorithm/string/classification.hpp&gt; #include &lt;boost/foreach.hpp&gt; using std::string; using std::cout; using std::ifstream; using std::stringstream; using std::vector; std::string file_to_string() { ifstream data("data.txt"); stringstream s; s &lt;&lt; data.rdbuf(); return s.str(); } void print_parameter(vector&lt;string&gt;&amp; v) { cout &lt;&lt; v_para[0]; cout &lt;&lt; "="; cout &lt;&lt; v_para[1]; cout &lt;&lt; std::endl; } vector&lt;string&gt; string_to_lines(const string&amp; s) { return v_lines; } int main() { vector&lt;string&gt; v_lines; boost::split(v_lines, file_to_string(), boost::is_any_of("\n"), boost::token_compress_on); vector&lt;string&gt; v_para; BOOST_FOREACH(string&amp; line, v_lines) { if(line.empty()) continue; boost::split(v_para, line, boost::is_any_of(" ="), boost::token_compress_on); // test it print_parameter(v_para); } } </code></pre>
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